A lightweight program to monitor the events of the file system through the inotify kernel library and triggers user defined commands based on event type.
License: GNU General Public License v2.0
Execute the command provided by the -c --command option, with the system() function instead of exec(). This is assume that the computer host in which cwatch is in execution can call "/bin/sh -c".
From the inotifywait manual:
--exclude
Do not process any events whose filename matches the specified POSIX extended regular expression, case sensitive.
Reference about the library:
http://www.gnu.org/software/libc/manual/html_node/Regular-Expressions.html
The -x option will replace the -a option!
A reiterate watch and unwatch of a resource causes an unexpected behaviour during the execution of the command. This is a critical issue. Revision and bug fixing of the code is scheduled for 27th and 28th of April.
It may be useful that the --regex-catch is able to handle an arbitrary number of regular expression patterns
es. cwatch -d /myDir/ -c "echo helloWorld" --regex-catch Regex1,Regex2,...,RegexN
Do a series of test with "valgrind" to perform controls against the memory management and allocation.
PASS: check_list
../build-aux/test-driver: line 107: 2901 Aborted "$@" > $log_file 2>&1
FAIL: check_cwatch
PASS: check_commandline
============================================================================
Testsuite summary for cwatch 1.2 experimental
============================================================================
# TOTAL: 3
# PASS: 2
# SKIP: 0
# XFAIL: 0
# FAIL: 1
# XPASS: 0
# ERROR: 0
==2901==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000002180 at pc 0x00000054a362 bp 0x7ffcd4efab60 sp 0x7ffcd4efab58
READ of size 8 at 0x603000002180 thread T0
#0 0x54a361 in remove_orphan_watched_resources /tmp/cwatch/src/cwatch.c
#1 0x549893 in remove_unreachable_resources /tmp/cwatch/src/cwatch.c:893:9
#2 0x54a51b in unwatch_symlink /tmp/cwatch/src/cwatch.c:978:9
#3 0x50a3d2 in unwatch_an_outside_directory_removing_a_symlink_inside /tmp/cwatch/tests/check_cwatch.c:511:5
#4 0x7fca70838efb in tcase_run_tfun_nofork /tmp/portage/dev-libs/check-0.9.11/work/check-0.9.11/src/check_run.c:328
#5 0x7fca708391e1 in srunner_iterate_tcase_tfuns /tmp/portage/dev-libs/check-0.9.11/work/check-0.9.11/src/check_run.c:187
#6 0x7fca708391e1 in srunner_run_tcase /tmp/portage/dev-libs/check-0.9.11/work/check-0.9.11/src/check_run.c:314
#7 0x7fca708391e1 in srunner_iterate_suites /tmp/portage/dev-libs/check-0.9.11/work/check-0.9.11/src/check_run.c:156
#8 0x7fca708391e1 in srunner_run /tmp/portage/dev-libs/check-0.9.11/work/check-0.9.11/src/check_run.c:626
#9 0x50b3f0 in main /tmp/cwatch/tests/check_cwatch.c:636:5
#10 0x7fca6f979680 in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#11 0x419e48 in _start (/tmp/cwatch/tests/check_cwatch+0x419e48)
0x603000002180 is located 16 bytes inside of 24-byte region [0x603000002170,0x603000002188)
freed by thread T0 here:
#0 0x4cf640 in __interceptor_cfree.localalias.1 /tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.0/work/compiler-rt-4.0.0.src/lib/asan/asan_malloc_linux.cc:55
#1 0x549fcb in remove_orphan_watched_resources /tmp/cwatch/src/cwatch.c:950:13
#2 0x549893 in remove_unreachable_resources /tmp/cwatch/src/cwatch.c:893:9
#3 0x54a51b in unwatch_symlink /tmp/cwatch/src/cwatch.c:978:9
#4 0x50a3d2 in unwatch_an_outside_directory_removing_a_symlink_inside /tmp/cwatch/tests/check_cwatch.c:511:5
#5 0x7fca70838efb in tcase_run_tfun_nofork /tmp/portage/dev-libs/check-0.9.11/work/check-0.9.11/src/check_run.c:328
previously allocated by thread T0 here:
#0 0x4cf7f8 in __interceptor_malloc /tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.0/work/compiler-rt-4.0.0.src/lib/asan/asan_malloc_linux.cc:66
#1 0x5432f0 in list_push /tmp/cwatch/src/list.c:42:37
#2 0x548cf5 in add_to_watch_list /tmp/cwatch/src/cwatch.c:817:20
#3 0x50a3c0 in unwatch_an_outside_directory_removing_a_symlink_inside /tmp/cwatch/tests/check_cwatch.c:509:5
#4 0x7fca70838efb in tcase_run_tfun_nofork /tmp/portage/dev-libs/check-0.9.11/work/check-0.9.11/src/check_run.c:328
SUMMARY: AddressSanitizer: heap-use-after-free /tmp/cwatch/src/cwatch.c in remove_orphan_watched_resources
Shadow bytes around the buggy address:
0x0c067fff83e0: 00 00 00 fa fa fa fd fd fd fa fa fa fd fd fd fd
0x0c067fff83f0: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd
0x0c067fff8400: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
0x0c067fff8410: fd fd fd fd fa fa 00 00 00 fa fa fa 00 00 00 fa
0x0c067fff8420: fa fa fd fd fd fd fa fa 00 00 00 fa fa fa fd fd
=>0x0c067fff8430:[fd]fa fa fa fd fd fd fd fa fa fd fd fd fa fa fa
0x0c067fff8440: fd fd fd fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8450: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8460: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8470: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8480: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==2901==ABORTING
FAIL check_cwatch (exit status: 134)
It is necessary to perform a depth check over the handling of the unwatching of the symbolic links. Revision confirmed to be complete on the March 30th-31th, 2013
Scheduled a code refactor after issue #9
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